Haifeng Liang1, Zhaokun Cui2, Qingping Song3. 1. Department of Surgery, Liaocheng Cancer Hospital, Liaocheng, 252000, People's Republic of China. 2. Department of Anesthesia and Surgery Center, Liaocheng Cancer Hospital, Liaocheng, 252000, People's Republic of China. 3. Department of Thoracic Surgery, Liaocheng Cancer Hospital, Liaocheng, 252000, People's Republic of China. 155251813@qq.com.